【摘要】 为了驱动低能重复频率高阻抗X光管,采用低感陶瓷电容构建了一套电长度约33.5ns、阻抗约8Ω的Blumlein型脉冲形成网络(BPFN),在匹配负载条件下研究了采用GaAs光导开关(PCSS)作为脉冲输出开关时PCSS工作场强、激光触发能量与能量转换效率的关系。实验表明:PCSS截止场强为3.21～4.94kV/cm,在工作场强高于20kV/cm时,截止场强引起的能量损失对能量转换效率的影响不大;PCSS较高的导通电阻是影响PFN能量转换效率的主要因素,随着工作场强、激光触发能量的上升,能量转换效率呈指数上升趋势。更多还原

【Abstract】 A Blumlein-PFN(BPFN) was fabricated and the factors that affect energy transfer efficiency were investigated.The BPFN is composed of ceramic capacitor,aluminum strip and GaAs-PCSS.Air-gap was selected as the BPFN pulse forming switch first,then expected pulse width and BPFN’s impedance were obtained,which confirms the effectiveness of our design.Experiments were conducted with GaAs-PCSS under different electric field and trigger laser energy.Results show that the loss induced by maintaining electric field is negligible when electric field is greater than 25 kV/cm and trigger laser energy of PCSS is between 3.12 kV/cm and 4.94 kV/cm.When trigger laser energy equals to 30.4mJ and 3.5 mJ,the energy efficiency of matched load is 62.9% and 55%,and the equivalent connective resistance is 2.3 Ω and 3.13 Ω respectively.The connective resistance has been proved to be the most important factor which limits energy efficiency.更多还原